CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3actionmailer
Souman Mandal
Souman Mandal

Reputation: 115

Set header in mail interceptor in Rails 3

I want to set a header value for all the mails. I want to do it in interceptor, so that I don't have to repeat the code for all the mails.

If I do it inside the mailer function, the code will be like following,

headers['X-Mailgun-Campaign-Id'] = "1234"

But how I can achieve the same using interceptor?

Upvotes: 2

Views: 878

Answers (2)

Kyletns
Kyletns

Reputation: 444

In case anyone finds this looking for the same answer I was, which was how to override an existing header in an interceptor, here's what I ended up using.

message.header.fields.select{|f| f.name == 'X-Custom-Header' }
                     .each{|f| message.header.fields.delete(f) }

// these two following lines work equivalently in Rails 4:
message.headers['X-Custom-Header'] = "1234"
message.header 'X-Custom-Header' => "1234"

Headers are stored internally in an array, not a hash, so in order to "override" you must first remove the header completely. Otherwise your "override" will actually just add another header with the same name, and it's hard to know how that will be handled on the other end.

Upvotes: 3

QuarkleMotion
QuarkleMotion

Reputation: 874

I had a similar problem with setting custom headers in an ActionMailer interceptor. The standard syntax as used within your mailer does not work:

def self.delivering_email(message)
  message.headers['X-Mailgun-Campaign-Id'] = "1234"
end

... but this hash-style syntax noted in the source code does work:

def self.delivering_email(message)
  message.headers 'X-Mailgun-Campaign-Id' => "1234"
end

Upvotes: 8

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